Improvement in steam-boiler casings and furnaces



(149%)- 2 Sheets--Sheet 2.

WILLiAM P. HALL.

improvement in Steam Boiler Casing and Furnace.

N0. 122,010, Patented Dec. 19,1871.

Witn'eeses: Inventor (149;) 2Sheets--She et1.

\ WILLIAM P. HALL.

Improvement in Steam Boiler Casing and Furnace.

N0. 122,010 Patented Dec.|9,1871.

I, v I i L L L "i L I W1tnesses: Inventor vlttor'neys.

AM. Mara-un-mma awe as a x (0:590:15? Palm-ml UNITED STATES PATENT 0-FFICE.

WILLIAM P. HALL, OF PIQUA, OHIO.

Specification forming part of Letters Patent No. 122,010, dated December 19, 1871.

To all whom it may concern:

Beit known that I, WILLIAM F. HALL, of Piqua, in the county of Miami and in the State of Ohio, have invented certain new and useful Improvements in Steam-Boiler Casing and Furnace; and do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawing and to the letters of reference marked thereon making a part of this specification.

The nature of my invention consists in the construction and arrangement of a steam-boiler casing, and also of a furnace, as will be hereinafter more fully set forth.

In order to enable others skilled in the art to which my invention appertains to make and use the same, I will now proceed to describe its construction and operation, referring to the annexed drawing, in which- Figure 1 is a front end view, with the front wall removed; and Fig. 2 is a longitudinal vertical section of my steam-boiler casing and furnace. Fig. 3 is a side view of an exterior air-receiver used with my furnace. Fig. 4. is a rear end view of my steam-boiler casing, with the rear wall removed.

A represents a horizontal return-flue steamboiler, which is placed within a brick casing, B, entirely surrounding the boiler. This casing B is, at the front end, of just such interior diameter that the boiler, or rather the front end of the boiler, will entirely fill the same, while immediately back of the front end and its entire length rearward the interior diameter of the casing is so much larger than that of the boiler that the flames and heat will have free play around all sides of the boiler. The boiler and easing are further so arranged that the space between them at the bottom will be larger than at the top, as more particularly shown in Fig. 4. The interior of the casing B, as well as the boiler, are true circles; but the boiler is supported upon feet 0 0, so as to be out of the center of the casing and thus give the inequality in the space between them, as mentioned above. In the front end of the casing B, below the boiler, are the furnaces D D, constructed as will be hereinafter described. The flames, smoke, 850., from these furnaces pass up under the boiler B, completely enveloping the same, and enter a circular recess, a, in the rear wall E, said recess corresponding with the interior of the casing; and from thence the smoke,- heat, &c., pass forward through the flues of the boiler into a similar recess, a, in the front wall E, and fronrjthence up through the chimney Gr. By this means the entire surface of the boiler is made a heating-surface, not only the bottom and through the flues, as is usually the case, but also the top and ends of the same. The space below the boiler being larger than that above, equalizes the heat on all parts of the boiler, as the tendency of heat is to rise, and the excess of space below the boiler gives room for more of the flames to go through there than at the sides or top. The front and back walls E E are provided with suitable doors for cleaning out the flues of the boiler. To prevent radiation of heat from the sides and top of the casin g B, I surround the same with a sheet-metal cap or covering, H, leaving a suitable space between the two, which space is to be filled with ashes or other convenient nonconducting material. The furnaces D D, at the front end of the casing under the boiler, are each provided with an air-chamber, 1), around the sides and top, as shown in Fig. 1, said furnaces being in arch form. From these air-chambers small apertures it lead into the space below the boiler directly at or above the point where the flames, smoke, &c., from the furnaces enter said space, for thepurpose of admitting jets of air to aid in combustion. In place of jets of air a complete sheet of air may be admitted by a narrow continuous opening instead of the apertures i i,- but I prefer said apertures, as thereby the strength of the brick-work need not be diminished. ()n the outside of each furnace is placed an air-receiver, I, into which air is forced by a fan 01 blower, and from which the air is forced, through a tube, (1, into the ash pit under the furnace so as to come up through the grate. Another tube, 6, leads from the exterior air-receiver I to the air chamber b, so that the air may be forced into said air-chamber, and, through the apertures t' i, intc the casing, for the purposes above mentioned.

I do not intend to confine myself to the use 01 these furnaces with my steam-boiler casing, a: any furnace may be used with the casin g, and my furnace may be used for every purpose where z furnace is needed.

The amount of air admitted into the air-cham hers I) b from the exterior air-receivers I I ma be regulated by a damper, f, in the tube 6.

Having thus fully described my invention, what claim as new, and desire to secure by Letters Patent, is

1. The horizontal return-flue boiler A Within he casing B, with a hot-air space between all ides and ends of the boiler and the casing to llow the heat to entirely envelop the boiler, subtantially as set forth.

2. The combination, with the casing B, boiler l, and surrounding chamber, of the end walls E l, provided with inner recesses a a, of a diamter larger than that of the boiler, substantially s and for the purposes herein set forth.

3. The combination, with the casing B and its Witnesses: WM. P. HALL.

HARRY 0. Soon, I. HUDAWAY. (149) 

